提出一种基于多项式的接收端判决反馈非线性均衡器结构，并以QAM信号为例，进行理论分析与数值仿真。结果表明，当功放的饱和功率回退为3.5 dB时，所提非线性均衡器能显著改善功放带来的非线性失真，矫正接收星座点的幅度和相位畸变，使接收星座点更清晰，在误码率10-2处带来解调信噪比收益约4.4 dB。同时，发射端功放无需更多的功率回退来保证接收线性度，等效提升了发射功率。此外，所提非线性均衡器结构相对简单，且易于工程实现。%A polynomial-based nonlinear decision feedback equalizer structure is proposed, and with QAM signal as an example, the theoretical analysis and numerical simulation are done. The simulation results indicate that when the amplifier output back off is 3.5dB, the proposed nonlinear decision feedback equalizer could noteworthily improve the nonlinear distortion resulted from power amplification, and bring a signal-to-noise ratio gain of 4.4dB at a bit error ratio of 10-2. In addition, the amplifier do not require more output power back off to keep the signal linearity, and this is equal to raising the transmit power. All this indicates that the proposed nonlinear equalizer is relatively simple in structure and easy for engineering implementation.
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